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2000:
Feola R P; Czuprynski C J
Binding of bovine growth hormone to. Mycobacterium avium ss paratuberculosis.
Comparative immunology, microbiology and infectious diseases 2000;
23(
3):.
Mycobacterium avium ss paratuberculosis causes a chronic progressive enteritis in cattle and other ruminants referred to as Johne's disease. It also has been suggested by some as possibly being associated with Crohn's disease in humans. In a previous study we observed that incubation of bovine monocytes with recombinant bovine growth hormone (bGH) altered the ingestion and intracellular growth of M. avium ss paratuberculosis in vitro. This led us to investigate whether bGH also has a direct effect on M. avium ss paratuberculosis. We observed that addition of bGH (5 microg/ml) had a direct inhibitory effect on the growth of M. avium ss paratuberculosis in Middlebrook 7H9 broth. In contrast, the growth of Mycobacterium smegmatis was unaffected, even at a bGH concentration of 50 microg/ml. Using 125I-bGH we observed high affinity binding (Kd = 1.32 nM) of bGH to M. avium ss paratuberculosis, with an estimated 204 binding sites per bacillus. To the best of our knowledge, this is the first report of a mammalian hormone binding to this important enteric pathogen.
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